projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
[deliverable/linux.git] / net / netfilter / nfnetlink_queue_core.c
1 /*
2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
4 *
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
7 *
8 * Based on the old ipv4-only ip_queue.c:
9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17 #include <linux/module.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/proc_fs.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
28 #include <linux/netfilter_bridge.h>
29 #include <linux/netfilter/nfnetlink.h>
30 #include <linux/netfilter/nfnetlink_queue.h>
31 #include <linux/list.h>
32 #include <net/sock.h>
33 #include <net/tcp_states.h>
34 #include <net/netfilter/nf_queue.h>
35 #include <net/netns/generic.h>
36 #include <net/netfilter/nfnetlink_queue.h>
37
38 #include <linux/atomic.h>
39
40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
41 #include "../bridge/br_private.h"
42 #endif
43
44 #define NFQNL_QMAX_DEFAULT 1024
45
46 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
47 * includes the header length. Thus, the maximum packet length that we
48 * support is 65531 bytes. We send truncated packets if the specified length
49 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
50 * attribute to detect truncation.
51 */
52 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
53
54 struct nfqnl_instance {
55 struct hlist_node hlist; /* global list of queues */
56 struct rcu_head rcu;
57
58 u32 peer_portid;
59 unsigned int queue_maxlen;
60 unsigned int copy_range;
61 unsigned int queue_dropped;
62 unsigned int queue_user_dropped;
63
64
65 u_int16_t queue_num; /* number of this queue */
66 u_int8_t copy_mode;
67 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
68 /*
69 * Following fields are dirtied for each queued packet,
70 * keep them in same cache line if possible.
71 */
72 spinlock_t lock;
73 unsigned int queue_total;
74 unsigned int id_sequence; /* 'sequence' of pkt ids */
75 struct list_head queue_list; /* packets in queue */
76 };
77
78 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
79
80 static int nfnl_queue_net_id __read_mostly;
81
82 #define INSTANCE_BUCKETS 16
83 struct nfnl_queue_net {
84 spinlock_t instances_lock;
85 struct hlist_head instance_table[INSTANCE_BUCKETS];
86 };
87
88 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
89 {
90 return net_generic(net, nfnl_queue_net_id);
91 }
92
93 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
94 {
95 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
96 }
97
98 static struct nfqnl_instance *
99 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
100 {
101 struct hlist_head *head;
102 struct nfqnl_instance *inst;
103
104 head = &q->instance_table[instance_hashfn(queue_num)];
105 hlist_for_each_entry_rcu(inst, head, hlist) {
106 if (inst->queue_num == queue_num)
107 return inst;
108 }
109 return NULL;
110 }
111
112 static struct nfqnl_instance *
113 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
114 {
115 struct nfqnl_instance *inst;
116 unsigned int h;
117 int err;
118
119 spin_lock(&q->instances_lock);
120 if (instance_lookup(q, queue_num)) {
121 err = -EEXIST;
122 goto out_unlock;
123 }
124
125 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
126 if (!inst) {
127 err = -ENOMEM;
128 goto out_unlock;
129 }
130
131 inst->queue_num = queue_num;
132 inst->peer_portid = portid;
133 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
134 inst->copy_range = NFQNL_MAX_COPY_RANGE;
135 inst->copy_mode = NFQNL_COPY_NONE;
136 spin_lock_init(&inst->lock);
137 INIT_LIST_HEAD(&inst->queue_list);
138
139 if (!try_module_get(THIS_MODULE)) {
140 err = -EAGAIN;
141 goto out_free;
142 }
143
144 h = instance_hashfn(queue_num);
145 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
146
147 spin_unlock(&q->instances_lock);
148
149 return inst;
150
151 out_free:
152 kfree(inst);
153 out_unlock:
154 spin_unlock(&q->instances_lock);
155 return ERR_PTR(err);
156 }
157
158 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
159 unsigned long data);
160
161 static void
162 instance_destroy_rcu(struct rcu_head *head)
163 {
164 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
165 rcu);
166
167 nfqnl_flush(inst, NULL, 0);
168 kfree(inst);
169 module_put(THIS_MODULE);
170 }
171
172 static void
173 __instance_destroy(struct nfqnl_instance *inst)
174 {
175 hlist_del_rcu(&inst->hlist);
176 call_rcu(&inst->rcu, instance_destroy_rcu);
177 }
178
179 static void
180 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
181 {
182 spin_lock(&q->instances_lock);
183 __instance_destroy(inst);
184 spin_unlock(&q->instances_lock);
185 }
186
187 static inline void
188 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
189 {
190 list_add_tail(&entry->list, &queue->queue_list);
191 queue->queue_total++;
192 }
193
194 static void
195 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
196 {
197 list_del(&entry->list);
198 queue->queue_total--;
199 }
200
201 static struct nf_queue_entry *
202 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
203 {
204 struct nf_queue_entry *entry = NULL, *i;
205
206 spin_lock_bh(&queue->lock);
207
208 list_for_each_entry(i, &queue->queue_list, list) {
209 if (i->id == id) {
210 entry = i;
211 break;
212 }
213 }
214
215 if (entry)
216 __dequeue_entry(queue, entry);
217
218 spin_unlock_bh(&queue->lock);
219
220 return entry;
221 }
222
223 static void
224 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
225 {
226 struct nf_queue_entry *entry, *next;
227
228 spin_lock_bh(&queue->lock);
229 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
230 if (!cmpfn || cmpfn(entry, data)) {
231 list_del(&entry->list);
232 queue->queue_total--;
233 nf_reinject(entry, NF_DROP);
234 }
235 }
236 spin_unlock_bh(&queue->lock);
237 }
238
239 static int
240 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
241 bool csum_verify)
242 {
243 __u32 flags = 0;
244
245 if (packet->ip_summed == CHECKSUM_PARTIAL)
246 flags = NFQA_SKB_CSUMNOTREADY;
247 else if (csum_verify)
248 flags = NFQA_SKB_CSUM_NOTVERIFIED;
249
250 if (skb_is_gso(packet))
251 flags |= NFQA_SKB_GSO;
252
253 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
254 }
255
256 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
257 {
258 const struct cred *cred;
259
260 if (!sk_fullsock(sk))
261 return 0;
262
263 read_lock_bh(&sk->sk_callback_lock);
264 if (sk->sk_socket && sk->sk_socket->file) {
265 cred = sk->sk_socket->file->f_cred;
266 if (nla_put_be32(skb, NFQA_UID,
267 htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
268 goto nla_put_failure;
269 if (nla_put_be32(skb, NFQA_GID,
270 htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
271 goto nla_put_failure;
272 }
273 read_unlock_bh(&sk->sk_callback_lock);
274 return 0;
275
276 nla_put_failure:
277 read_unlock_bh(&sk->sk_callback_lock);
278 return -1;
279 }
280
281 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
282 {
283 u32 seclen = 0;
284 #if IS_ENABLED(CONFIG_NETWORK_SECMARK)
285 if (!skb || !sk_fullsock(skb->sk))
286 return 0;
287
288 read_lock_bh(&skb->sk->sk_callback_lock);
289
290 if (skb->secmark)
291 security_secid_to_secctx(skb->secmark, secdata, &seclen);
292
293 read_unlock_bh(&skb->sk->sk_callback_lock);
294 #endif
295 return seclen;
296 }
297
298 static struct sk_buff *
299 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
300 struct nf_queue_entry *entry,
301 __be32 **packet_id_ptr)
302 {
303 size_t size;
304 size_t data_len = 0, cap_len = 0;
305 unsigned int hlen = 0;
306 struct sk_buff *skb;
307 struct nlattr *nla;
308 struct nfqnl_msg_packet_hdr *pmsg;
309 struct nlmsghdr *nlh;
310 struct nfgenmsg *nfmsg;
311 struct sk_buff *entskb = entry->skb;
312 struct net_device *indev;
313 struct net_device *outdev;
314 struct nf_conn *ct = NULL;
315 enum ip_conntrack_info uninitialized_var(ctinfo);
316 bool csum_verify;
317 char *secdata = NULL;
318 u32 seclen = 0;
319
320 size = nlmsg_total_size(sizeof(struct nfgenmsg))
321 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
322 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
323 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
324 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
325 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
326 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
327 #endif
328 + nla_total_size(sizeof(u_int32_t)) /* mark */
329 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
330 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
331 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
332
333 if (entskb->tstamp.tv64)
334 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
335
336 if (entry->state.hook <= NF_INET_FORWARD ||
337 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
338 csum_verify = !skb_csum_unnecessary(entskb);
339 else
340 csum_verify = false;
341
342 outdev = entry->state.out;
343
344 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
345 case NFQNL_COPY_META:
346 case NFQNL_COPY_NONE:
347 break;
348
349 case NFQNL_COPY_PACKET:
350 if (!(queue->flags & NFQA_CFG_F_GSO) &&
351 entskb->ip_summed == CHECKSUM_PARTIAL &&
352 skb_checksum_help(entskb))
353 return NULL;
354
355 data_len = ACCESS_ONCE(queue->copy_range);
356 if (data_len > entskb->len)
357 data_len = entskb->len;
358
359 hlen = skb_zerocopy_headlen(entskb);
360 hlen = min_t(unsigned int, hlen, data_len);
361 size += sizeof(struct nlattr) + hlen;
362 cap_len = entskb->len;
363 break;
364 }
365
366 if (queue->flags & NFQA_CFG_F_CONNTRACK)
367 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
368
369 if (queue->flags & NFQA_CFG_F_UID_GID) {
370 size += (nla_total_size(sizeof(u_int32_t)) /* uid */
371 + nla_total_size(sizeof(u_int32_t))); /* gid */
372 }
373
374 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
375 seclen = nfqnl_get_sk_secctx(entskb, &secdata);
376 if (seclen)
377 size += nla_total_size(seclen);
378 }
379
380 skb = nfnetlink_alloc_skb(net, size, queue->peer_portid,
381 GFP_ATOMIC);
382 if (!skb) {
383 skb_tx_error(entskb);
384 return NULL;
385 }
386
387 nlh = nlmsg_put(skb, 0, 0,
388 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
389 sizeof(struct nfgenmsg), 0);
390 if (!nlh) {
391 skb_tx_error(entskb);
392 kfree_skb(skb);
393 return NULL;
394 }
395 nfmsg = nlmsg_data(nlh);
396 nfmsg->nfgen_family = entry->state.pf;
397 nfmsg->version = NFNETLINK_V0;
398 nfmsg->res_id = htons(queue->queue_num);
399
400 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
401 pmsg = nla_data(nla);
402 pmsg->hw_protocol = entskb->protocol;
403 pmsg->hook = entry->state.hook;
404 *packet_id_ptr = &pmsg->packet_id;
405
406 indev = entry->state.in;
407 if (indev) {
408 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
409 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
410 goto nla_put_failure;
411 #else
412 if (entry->state.pf == PF_BRIDGE) {
413 /* Case 1: indev is physical input device, we need to
414 * look for bridge group (when called from
415 * netfilter_bridge) */
416 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
417 htonl(indev->ifindex)) ||
418 /* this is the bridge group "brX" */
419 /* rcu_read_lock()ed by __nf_queue */
420 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
421 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
422 goto nla_put_failure;
423 } else {
424 int physinif;
425
426 /* Case 2: indev is bridge group, we need to look for
427 * physical device (when called from ipv4) */
428 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
429 htonl(indev->ifindex)))
430 goto nla_put_failure;
431
432 physinif = nf_bridge_get_physinif(entskb);
433 if (physinif &&
434 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
435 htonl(physinif)))
436 goto nla_put_failure;
437 }
438 #endif
439 }
440
441 if (outdev) {
442 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
443 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
444 goto nla_put_failure;
445 #else
446 if (entry->state.pf == PF_BRIDGE) {
447 /* Case 1: outdev is physical output device, we need to
448 * look for bridge group (when called from
449 * netfilter_bridge) */
450 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
451 htonl(outdev->ifindex)) ||
452 /* this is the bridge group "brX" */
453 /* rcu_read_lock()ed by __nf_queue */
454 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
455 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
456 goto nla_put_failure;
457 } else {
458 int physoutif;
459
460 /* Case 2: outdev is bridge group, we need to look for
461 * physical output device (when called from ipv4) */
462 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
463 htonl(outdev->ifindex)))
464 goto nla_put_failure;
465
466 physoutif = nf_bridge_get_physoutif(entskb);
467 if (physoutif &&
468 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
469 htonl(physoutif)))
470 goto nla_put_failure;
471 }
472 #endif
473 }
474
475 if (entskb->mark &&
476 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
477 goto nla_put_failure;
478
479 if (indev && entskb->dev &&
480 entskb->mac_header != entskb->network_header) {
481 struct nfqnl_msg_packet_hw phw;
482 int len;
483
484 memset(&phw, 0, sizeof(phw));
485 len = dev_parse_header(entskb, phw.hw_addr);
486 if (len) {
487 phw.hw_addrlen = htons(len);
488 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
489 goto nla_put_failure;
490 }
491 }
492
493 if (entskb->tstamp.tv64) {
494 struct nfqnl_msg_packet_timestamp ts;
495 struct timeval tv = ktime_to_timeval(entskb->tstamp);
496 ts.sec = cpu_to_be64(tv.tv_sec);
497 ts.usec = cpu_to_be64(tv.tv_usec);
498
499 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
500 goto nla_put_failure;
501 }
502
503 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
504 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
505 goto nla_put_failure;
506
507 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
508 goto nla_put_failure;
509
510 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
511 goto nla_put_failure;
512
513 if (cap_len > data_len &&
514 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
515 goto nla_put_failure;
516
517 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
518 goto nla_put_failure;
519
520 if (data_len) {
521 struct nlattr *nla;
522
523 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
524 goto nla_put_failure;
525
526 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
527 nla->nla_type = NFQA_PAYLOAD;
528 nla->nla_len = nla_attr_size(data_len);
529
530 if (skb_zerocopy(skb, entskb, data_len, hlen))
531 goto nla_put_failure;
532 }
533
534 nlh->nlmsg_len = skb->len;
535 return skb;
536
537 nla_put_failure:
538 skb_tx_error(entskb);
539 kfree_skb(skb);
540 net_err_ratelimited("nf_queue: error creating packet message\n");
541 return NULL;
542 }
543
544 static int
545 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
546 struct nf_queue_entry *entry)
547 {
548 struct sk_buff *nskb;
549 int err = -ENOBUFS;
550 __be32 *packet_id_ptr;
551 int failopen = 0;
552
553 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
554 if (nskb == NULL) {
555 err = -ENOMEM;
556 goto err_out;
557 }
558 spin_lock_bh(&queue->lock);
559
560 if (queue->queue_total >= queue->queue_maxlen) {
561 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
562 failopen = 1;
563 err = 0;
564 } else {
565 queue->queue_dropped++;
566 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
567 queue->queue_total);
568 }
569 goto err_out_free_nskb;
570 }
571 entry->id = ++queue->id_sequence;
572 *packet_id_ptr = htonl(entry->id);
573
574 /* nfnetlink_unicast will either free the nskb or add it to a socket */
575 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
576 if (err < 0) {
577 queue->queue_user_dropped++;
578 goto err_out_unlock;
579 }
580
581 __enqueue_entry(queue, entry);
582
583 spin_unlock_bh(&queue->lock);
584 return 0;
585
586 err_out_free_nskb:
587 kfree_skb(nskb);
588 err_out_unlock:
589 spin_unlock_bh(&queue->lock);
590 if (failopen)
591 nf_reinject(entry, NF_ACCEPT);
592 err_out:
593 return err;
594 }
595
596 static struct nf_queue_entry *
597 nf_queue_entry_dup(struct nf_queue_entry *e)
598 {
599 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
600 if (entry) {
601 if (nf_queue_entry_get_refs(entry))
602 return entry;
603 kfree(entry);
604 }
605 return NULL;
606 }
607
608 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
609 /* When called from bridge netfilter, skb->data must point to MAC header
610 * before calling skb_gso_segment(). Else, original MAC header is lost
611 * and segmented skbs will be sent to wrong destination.
612 */
613 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
614 {
615 if (skb->nf_bridge)
616 __skb_push(skb, skb->network_header - skb->mac_header);
617 }
618
619 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
620 {
621 if (skb->nf_bridge)
622 __skb_pull(skb, skb->network_header - skb->mac_header);
623 }
624 #else
625 #define nf_bridge_adjust_skb_data(s) do {} while (0)
626 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
627 #endif
628
629 static void free_entry(struct nf_queue_entry *entry)
630 {
631 nf_queue_entry_release_refs(entry);
632 kfree(entry);
633 }
634
635 static int
636 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
637 struct sk_buff *skb, struct nf_queue_entry *entry)
638 {
639 int ret = -ENOMEM;
640 struct nf_queue_entry *entry_seg;
641
642 nf_bridge_adjust_segmented_data(skb);
643
644 if (skb->next == NULL) { /* last packet, no need to copy entry */
645 struct sk_buff *gso_skb = entry->skb;
646 entry->skb = skb;
647 ret = __nfqnl_enqueue_packet(net, queue, entry);
648 if (ret)
649 entry->skb = gso_skb;
650 return ret;
651 }
652
653 skb->next = NULL;
654
655 entry_seg = nf_queue_entry_dup(entry);
656 if (entry_seg) {
657 entry_seg->skb = skb;
658 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
659 if (ret)
660 free_entry(entry_seg);
661 }
662 return ret;
663 }
664
665 static int
666 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
667 {
668 unsigned int queued;
669 struct nfqnl_instance *queue;
670 struct sk_buff *skb, *segs;
671 int err = -ENOBUFS;
672 struct net *net = dev_net(entry->state.in ?
673 entry->state.in : entry->state.out);
674 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
675
676 /* rcu_read_lock()ed by nf_hook_slow() */
677 queue = instance_lookup(q, queuenum);
678 if (!queue)
679 return -ESRCH;
680
681 if (queue->copy_mode == NFQNL_COPY_NONE)
682 return -EINVAL;
683
684 skb = entry->skb;
685
686 switch (entry->state.pf) {
687 case NFPROTO_IPV4:
688 skb->protocol = htons(ETH_P_IP);
689 break;
690 case NFPROTO_IPV6:
691 skb->protocol = htons(ETH_P_IPV6);
692 break;
693 }
694
695 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
696 return __nfqnl_enqueue_packet(net, queue, entry);
697
698 nf_bridge_adjust_skb_data(skb);
699 segs = skb_gso_segment(skb, 0);
700 /* Does not use PTR_ERR to limit the number of error codes that can be
701 * returned by nf_queue. For instance, callers rely on -ECANCELED to
702 * mean 'ignore this hook'.
703 */
704 if (IS_ERR_OR_NULL(segs))
705 goto out_err;
706 queued = 0;
707 err = 0;
708 do {
709 struct sk_buff *nskb = segs->next;
710 if (err == 0)
711 err = __nfqnl_enqueue_packet_gso(net, queue,
712 segs, entry);
713 if (err == 0)
714 queued++;
715 else
716 kfree_skb(segs);
717 segs = nskb;
718 } while (segs);
719
720 if (queued) {
721 if (err) /* some segments are already queued */
722 free_entry(entry);
723 kfree_skb(skb);
724 return 0;
725 }
726 out_err:
727 nf_bridge_adjust_segmented_data(skb);
728 return err;
729 }
730
731 static int
732 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
733 {
734 struct sk_buff *nskb;
735
736 if (diff < 0) {
737 if (pskb_trim(e->skb, data_len))
738 return -ENOMEM;
739 } else if (diff > 0) {
740 if (data_len > 0xFFFF)
741 return -EINVAL;
742 if (diff > skb_tailroom(e->skb)) {
743 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
744 diff, GFP_ATOMIC);
745 if (!nskb) {
746 printk(KERN_WARNING "nf_queue: OOM "
747 "in mangle, dropping packet\n");
748 return -ENOMEM;
749 }
750 kfree_skb(e->skb);
751 e->skb = nskb;
752 }
753 skb_put(e->skb, diff);
754 }
755 if (!skb_make_writable(e->skb, data_len))
756 return -ENOMEM;
757 skb_copy_to_linear_data(e->skb, data, data_len);
758 e->skb->ip_summed = CHECKSUM_NONE;
759 return 0;
760 }
761
762 static int
763 nfqnl_set_mode(struct nfqnl_instance *queue,
764 unsigned char mode, unsigned int range)
765 {
766 int status = 0;
767
768 spin_lock_bh(&queue->lock);
769 switch (mode) {
770 case NFQNL_COPY_NONE:
771 case NFQNL_COPY_META:
772 queue->copy_mode = mode;
773 queue->copy_range = 0;
774 break;
775
776 case NFQNL_COPY_PACKET:
777 queue->copy_mode = mode;
778 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
779 queue->copy_range = NFQNL_MAX_COPY_RANGE;
780 else
781 queue->copy_range = range;
782 break;
783
784 default:
785 status = -EINVAL;
786
787 }
788 spin_unlock_bh(&queue->lock);
789
790 return status;
791 }
792
793 static int
794 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
795 {
796 if (entry->state.in)
797 if (entry->state.in->ifindex == ifindex)
798 return 1;
799 if (entry->state.out)
800 if (entry->state.out->ifindex == ifindex)
801 return 1;
802 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
803 if (entry->skb->nf_bridge) {
804 int physinif, physoutif;
805
806 physinif = nf_bridge_get_physinif(entry->skb);
807 physoutif = nf_bridge_get_physoutif(entry->skb);
808
809 if (physinif == ifindex || physoutif == ifindex)
810 return 1;
811 }
812 #endif
813 return 0;
814 }
815
816 /* drop all packets with either indev or outdev == ifindex from all queue
817 * instances */
818 static void
819 nfqnl_dev_drop(struct net *net, int ifindex)
820 {
821 int i;
822 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
823
824 rcu_read_lock();
825
826 for (i = 0; i < INSTANCE_BUCKETS; i++) {
827 struct nfqnl_instance *inst;
828 struct hlist_head *head = &q->instance_table[i];
829
830 hlist_for_each_entry_rcu(inst, head, hlist)
831 nfqnl_flush(inst, dev_cmp, ifindex);
832 }
833
834 rcu_read_unlock();
835 }
836
837 static int
838 nfqnl_rcv_dev_event(struct notifier_block *this,
839 unsigned long event, void *ptr)
840 {
841 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
842
843 /* Drop any packets associated with the downed device */
844 if (event == NETDEV_DOWN)
845 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
846 return NOTIFY_DONE;
847 }
848
849 static struct notifier_block nfqnl_dev_notifier = {
850 .notifier_call = nfqnl_rcv_dev_event,
851 };
852
853 static int
854 nfqnl_rcv_nl_event(struct notifier_block *this,
855 unsigned long event, void *ptr)
856 {
857 struct netlink_notify *n = ptr;
858 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
859
860 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
861 int i;
862
863 /* destroy all instances for this portid */
864 spin_lock(&q->instances_lock);
865 for (i = 0; i < INSTANCE_BUCKETS; i++) {
866 struct hlist_node *t2;
867 struct nfqnl_instance *inst;
868 struct hlist_head *head = &q->instance_table[i];
869
870 hlist_for_each_entry_safe(inst, t2, head, hlist) {
871 if (n->portid == inst->peer_portid)
872 __instance_destroy(inst);
873 }
874 }
875 spin_unlock(&q->instances_lock);
876 }
877 return NOTIFY_DONE;
878 }
879
880 static struct notifier_block nfqnl_rtnl_notifier = {
881 .notifier_call = nfqnl_rcv_nl_event,
882 };
883
884 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
885 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
886 [NFQA_MARK] = { .type = NLA_U32 },
887 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
888 [NFQA_CT] = { .type = NLA_UNSPEC },
889 [NFQA_EXP] = { .type = NLA_UNSPEC },
890 };
891
892 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
893 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
894 [NFQA_MARK] = { .type = NLA_U32 },
895 };
896
897 static struct nfqnl_instance *
898 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
899 {
900 struct nfqnl_instance *queue;
901
902 queue = instance_lookup(q, queue_num);
903 if (!queue)
904 return ERR_PTR(-ENODEV);
905
906 if (queue->peer_portid != nlportid)
907 return ERR_PTR(-EPERM);
908
909 return queue;
910 }
911
912 static struct nfqnl_msg_verdict_hdr*
913 verdicthdr_get(const struct nlattr * const nfqa[])
914 {
915 struct nfqnl_msg_verdict_hdr *vhdr;
916 unsigned int verdict;
917
918 if (!nfqa[NFQA_VERDICT_HDR])
919 return NULL;
920
921 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
922 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
923 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
924 return NULL;
925 return vhdr;
926 }
927
928 static int nfq_id_after(unsigned int id, unsigned int max)
929 {
930 return (int)(id - max) > 0;
931 }
932
933 static int
934 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
935 const struct nlmsghdr *nlh,
936 const struct nlattr * const nfqa[])
937 {
938 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
939 struct nf_queue_entry *entry, *tmp;
940 unsigned int verdict, maxid;
941 struct nfqnl_msg_verdict_hdr *vhdr;
942 struct nfqnl_instance *queue;
943 LIST_HEAD(batch_list);
944 u16 queue_num = ntohs(nfmsg->res_id);
945
946 struct net *net = sock_net(ctnl);
947 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
948
949 queue = verdict_instance_lookup(q, queue_num,
950 NETLINK_CB(skb).portid);
951 if (IS_ERR(queue))
952 return PTR_ERR(queue);
953
954 vhdr = verdicthdr_get(nfqa);
955 if (!vhdr)
956 return -EINVAL;
957
958 verdict = ntohl(vhdr->verdict);
959 maxid = ntohl(vhdr->id);
960
961 spin_lock_bh(&queue->lock);
962
963 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
964 if (nfq_id_after(entry->id, maxid))
965 break;
966 __dequeue_entry(queue, entry);
967 list_add_tail(&entry->list, &batch_list);
968 }
969
970 spin_unlock_bh(&queue->lock);
971
972 if (list_empty(&batch_list))
973 return -ENOENT;
974
975 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
976 if (nfqa[NFQA_MARK])
977 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
978 nf_reinject(entry, verdict);
979 }
980 return 0;
981 }
982
983 static int
984 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
985 const struct nlmsghdr *nlh,
986 const struct nlattr * const nfqa[])
987 {
988 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
989 u_int16_t queue_num = ntohs(nfmsg->res_id);
990
991 struct nfqnl_msg_verdict_hdr *vhdr;
992 struct nfqnl_instance *queue;
993 unsigned int verdict;
994 struct nf_queue_entry *entry;
995 enum ip_conntrack_info uninitialized_var(ctinfo);
996 struct nf_conn *ct = NULL;
997
998 struct net *net = sock_net(ctnl);
999 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1000
1001 queue = instance_lookup(q, queue_num);
1002 if (!queue)
1003 queue = verdict_instance_lookup(q, queue_num,
1004 NETLINK_CB(skb).portid);
1005 if (IS_ERR(queue))
1006 return PTR_ERR(queue);
1007
1008 vhdr = verdicthdr_get(nfqa);
1009 if (!vhdr)
1010 return -EINVAL;
1011
1012 verdict = ntohl(vhdr->verdict);
1013
1014 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1015 if (entry == NULL)
1016 return -ENOENT;
1017
1018 if (nfqa[NFQA_CT]) {
1019 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
1020 if (ct && nfqa[NFQA_EXP]) {
1021 nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
1022 NETLINK_CB(skb).portid,
1023 nlmsg_report(nlh));
1024 }
1025 }
1026
1027 if (nfqa[NFQA_PAYLOAD]) {
1028 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1029 int diff = payload_len - entry->skb->len;
1030
1031 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1032 payload_len, entry, diff) < 0)
1033 verdict = NF_DROP;
1034
1035 if (ct)
1036 nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff);
1037 }
1038
1039 if (nfqa[NFQA_MARK])
1040 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1041
1042 nf_reinject(entry, verdict);
1043 return 0;
1044 }
1045
1046 static int
1047 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1048 const struct nlmsghdr *nlh,
1049 const struct nlattr * const nfqa[])
1050 {
1051 return -ENOTSUPP;
1052 }
1053
1054 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1055 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1056 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1057 };
1058
1059 static const struct nf_queue_handler nfqh = {
1060 .outfn = &nfqnl_enqueue_packet,
1061 };
1062
1063 static int
1064 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1065 const struct nlmsghdr *nlh,
1066 const struct nlattr * const nfqa[])
1067 {
1068 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1069 u_int16_t queue_num = ntohs(nfmsg->res_id);
1070 struct nfqnl_instance *queue;
1071 struct nfqnl_msg_config_cmd *cmd = NULL;
1072 struct net *net = sock_net(ctnl);
1073 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1074 int ret = 0;
1075
1076 if (nfqa[NFQA_CFG_CMD]) {
1077 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1078
1079 /* Obsolete commands without queue context */
1080 switch (cmd->command) {
1081 case NFQNL_CFG_CMD_PF_BIND: return 0;
1082 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1083 }
1084 }
1085
1086 rcu_read_lock();
1087 queue = instance_lookup(q, queue_num);
1088 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1089 ret = -EPERM;
1090 goto err_out_unlock;
1091 }
1092
1093 if (cmd != NULL) {
1094 switch (cmd->command) {
1095 case NFQNL_CFG_CMD_BIND:
1096 if (queue) {
1097 ret = -EBUSY;
1098 goto err_out_unlock;
1099 }
1100 queue = instance_create(q, queue_num,
1101 NETLINK_CB(skb).portid);
1102 if (IS_ERR(queue)) {
1103 ret = PTR_ERR(queue);
1104 goto err_out_unlock;
1105 }
1106 break;
1107 case NFQNL_CFG_CMD_UNBIND:
1108 if (!queue) {
1109 ret = -ENODEV;
1110 goto err_out_unlock;
1111 }
1112 instance_destroy(q, queue);
1113 break;
1114 case NFQNL_CFG_CMD_PF_BIND:
1115 case NFQNL_CFG_CMD_PF_UNBIND:
1116 break;
1117 default:
1118 ret = -ENOTSUPP;
1119 break;
1120 }
1121 }
1122
1123 if (nfqa[NFQA_CFG_PARAMS]) {
1124 struct nfqnl_msg_config_params *params;
1125
1126 if (!queue) {
1127 ret = -ENODEV;
1128 goto err_out_unlock;
1129 }
1130 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1131 nfqnl_set_mode(queue, params->copy_mode,
1132 ntohl(params->copy_range));
1133 }
1134
1135 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1136 __be32 *queue_maxlen;
1137
1138 if (!queue) {
1139 ret = -ENODEV;
1140 goto err_out_unlock;
1141 }
1142 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1143 spin_lock_bh(&queue->lock);
1144 queue->queue_maxlen = ntohl(*queue_maxlen);
1145 spin_unlock_bh(&queue->lock);
1146 }
1147
1148 if (nfqa[NFQA_CFG_FLAGS]) {
1149 __u32 flags, mask;
1150
1151 if (!queue) {
1152 ret = -ENODEV;
1153 goto err_out_unlock;
1154 }
1155
1156 if (!nfqa[NFQA_CFG_MASK]) {
1157 /* A mask is needed to specify which flags are being
1158 * changed.
1159 */
1160 ret = -EINVAL;
1161 goto err_out_unlock;
1162 }
1163
1164 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1165 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1166
1167 if (flags >= NFQA_CFG_F_MAX) {
1168 ret = -EOPNOTSUPP;
1169 goto err_out_unlock;
1170 }
1171 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1172 if (flags & mask & NFQA_CFG_F_SECCTX) {
1173 ret = -EOPNOTSUPP;
1174 goto err_out_unlock;
1175 }
1176 #endif
1177 spin_lock_bh(&queue->lock);
1178 queue->flags &= ~mask;
1179 queue->flags |= flags & mask;
1180 spin_unlock_bh(&queue->lock);
1181 }
1182
1183 err_out_unlock:
1184 rcu_read_unlock();
1185 return ret;
1186 }
1187
1188 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1189 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1190 .attr_count = NFQA_MAX, },
1191 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1192 .attr_count = NFQA_MAX,
1193 .policy = nfqa_verdict_policy },
1194 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1195 .attr_count = NFQA_CFG_MAX,
1196 .policy = nfqa_cfg_policy },
1197 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1198 .attr_count = NFQA_MAX,
1199 .policy = nfqa_verdict_batch_policy },
1200 };
1201
1202 static const struct nfnetlink_subsystem nfqnl_subsys = {
1203 .name = "nf_queue",
1204 .subsys_id = NFNL_SUBSYS_QUEUE,
1205 .cb_count = NFQNL_MSG_MAX,
1206 .cb = nfqnl_cb,
1207 };
1208
1209 #ifdef CONFIG_PROC_FS
1210 struct iter_state {
1211 struct seq_net_private p;
1212 unsigned int bucket;
1213 };
1214
1215 static struct hlist_node *get_first(struct seq_file *seq)
1216 {
1217 struct iter_state *st = seq->private;
1218 struct net *net;
1219 struct nfnl_queue_net *q;
1220
1221 if (!st)
1222 return NULL;
1223
1224 net = seq_file_net(seq);
1225 q = nfnl_queue_pernet(net);
1226 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1227 if (!hlist_empty(&q->instance_table[st->bucket]))
1228 return q->instance_table[st->bucket].first;
1229 }
1230 return NULL;
1231 }
1232
1233 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1234 {
1235 struct iter_state *st = seq->private;
1236 struct net *net = seq_file_net(seq);
1237
1238 h = h->next;
1239 while (!h) {
1240 struct nfnl_queue_net *q;
1241
1242 if (++st->bucket >= INSTANCE_BUCKETS)
1243 return NULL;
1244
1245 q = nfnl_queue_pernet(net);
1246 h = q->instance_table[st->bucket].first;
1247 }
1248 return h;
1249 }
1250
1251 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1252 {
1253 struct hlist_node *head;
1254 head = get_first(seq);
1255
1256 if (head)
1257 while (pos && (head = get_next(seq, head)))
1258 pos--;
1259 return pos ? NULL : head;
1260 }
1261
1262 static void *seq_start(struct seq_file *s, loff_t *pos)
1263 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1264 {
1265 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1266 return get_idx(s, *pos);
1267 }
1268
1269 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1270 {
1271 (*pos)++;
1272 return get_next(s, v);
1273 }
1274
1275 static void seq_stop(struct seq_file *s, void *v)
1276 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1277 {
1278 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1279 }
1280
1281 static int seq_show(struct seq_file *s, void *v)
1282 {
1283 const struct nfqnl_instance *inst = v;
1284
1285 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1286 inst->queue_num,
1287 inst->peer_portid, inst->queue_total,
1288 inst->copy_mode, inst->copy_range,
1289 inst->queue_dropped, inst->queue_user_dropped,
1290 inst->id_sequence, 1);
1291 return 0;
1292 }
1293
1294 static const struct seq_operations nfqnl_seq_ops = {
1295 .start = seq_start,
1296 .next = seq_next,
1297 .stop = seq_stop,
1298 .show = seq_show,
1299 };
1300
1301 static int nfqnl_open(struct inode *inode, struct file *file)
1302 {
1303 return seq_open_net(inode, file, &nfqnl_seq_ops,
1304 sizeof(struct iter_state));
1305 }
1306
1307 static const struct file_operations nfqnl_file_ops = {
1308 .owner = THIS_MODULE,
1309 .open = nfqnl_open,
1310 .read = seq_read,
1311 .llseek = seq_lseek,
1312 .release = seq_release_net,
1313 };
1314
1315 #endif /* PROC_FS */
1316
1317 static int __net_init nfnl_queue_net_init(struct net *net)
1318 {
1319 unsigned int i;
1320 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1321
1322 for (i = 0; i < INSTANCE_BUCKETS; i++)
1323 INIT_HLIST_HEAD(&q->instance_table[i]);
1324
1325 spin_lock_init(&q->instances_lock);
1326
1327 #ifdef CONFIG_PROC_FS
1328 if (!proc_create("nfnetlink_queue", 0440,
1329 net->nf.proc_netfilter, &nfqnl_file_ops))
1330 return -ENOMEM;
1331 #endif
1332 return 0;
1333 }
1334
1335 static void __net_exit nfnl_queue_net_exit(struct net *net)
1336 {
1337 #ifdef CONFIG_PROC_FS
1338 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1339 #endif
1340 }
1341
1342 static struct pernet_operations nfnl_queue_net_ops = {
1343 .init = nfnl_queue_net_init,
1344 .exit = nfnl_queue_net_exit,
1345 .id = &nfnl_queue_net_id,
1346 .size = sizeof(struct nfnl_queue_net),
1347 };
1348
1349 static int __init nfnetlink_queue_init(void)
1350 {
1351 int status;
1352
1353 status = register_pernet_subsys(&nfnl_queue_net_ops);
1354 if (status < 0) {
1355 pr_err("nf_queue: failed to register pernet ops\n");
1356 goto out;
1357 }
1358
1359 netlink_register_notifier(&nfqnl_rtnl_notifier);
1360 status = nfnetlink_subsys_register(&nfqnl_subsys);
1361 if (status < 0) {
1362 pr_err("nf_queue: failed to create netlink socket\n");
1363 goto cleanup_netlink_notifier;
1364 }
1365
1366 register_netdevice_notifier(&nfqnl_dev_notifier);
1367 nf_register_queue_handler(&nfqh);
1368 return status;
1369
1370 cleanup_netlink_notifier:
1371 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1372 out:
1373 return status;
1374 }
1375
1376 static void __exit nfnetlink_queue_fini(void)
1377 {
1378 nf_unregister_queue_handler();
1379 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1380 nfnetlink_subsys_unregister(&nfqnl_subsys);
1381 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1382 unregister_pernet_subsys(&nfnl_queue_net_ops);
1383
1384 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1385 }
1386
1387 MODULE_DESCRIPTION("netfilter packet queue handler");
1388 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1389 MODULE_LICENSE("GPL");
1390 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1391
1392 module_init(nfnetlink_queue_init);
1393 module_exit(nfnetlink_queue_fini);
Linux kernel - Deliverables
This page took 0.060884 seconds and 6 git commands to generate.